EP1453342A1 - Procédé de transmission de données par radio, serveur et contrôleur de réseau radio - Google Patents

Procédé de transmission de données par radio, serveur et contrôleur de réseau radio Download PDF

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Publication number
EP1453342A1
EP1453342A1 EP20040004431 EP04004431A EP1453342A1 EP 1453342 A1 EP1453342 A1 EP 1453342A1 EP 20040004431 EP20040004431 EP 20040004431 EP 04004431 A EP04004431 A EP 04004431A EP 1453342 A1 EP1453342 A1 EP 1453342A1
Authority
EP
European Patent Office
Prior art keywords
network controller
radio network
data
soft handover
mobile terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20040004431
Other languages
German (de)
English (en)
Inventor
Kenji c/o I.P.D. NTT DoCoMo Inc. Nishimura
Hiroshi c/o I.P.D. NTT DoCoMo Inc. Kawakami
Shoichi c/o I.P.D. NTT DoCoMo Inc. Hirata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Docomo Inc
Original Assignee
NTT Docomo Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTT Docomo Inc filed Critical NTT Docomo Inc
Publication of EP1453342A1 publication Critical patent/EP1453342A1/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H04W36/185—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection using make before break

Definitions

  • the soft handover process required for the implementation of soft handover in downlink radio data communications includes as follows:
  • the SRNC determines the timing of transmission from the SRNC to the Node B2 (at what value of the clock of the SRNC, what sequence number of data is to be transmitted), the timing of transmission from the Node B2 to the mobile terminal MN 1 (at what value of the clock of the Node B2, what sequence number of data is to be transmitted), and the timing of reception by the mobile terminal MN 1 (at what value of the clock given by the Node B2, what sequence number of data is to be received).
  • step 1011 when adding a branch to the Node B3, the mobile terminal MN 1 monitors the radio environment between the mobile terminal MN 1 and the Node B3, and detects that the radio environment between the mobile terminal MN 1 and the Node B3 becomes better.
  • step 1012 the mobile terminal MN 1 reports the fact to the SRNC.
  • a fifth aspect of the present invention is summarized as a radio network controller for performing a soft handover process for allowing soft handover of a mobile terminal, when the mobile terminal is performing soft handover, in downlink radio data communications in which data is transmitted to the mobile terminal via a base station.
  • the radio network controller includes a notification receiver, a transmission timing determiner, and a data transmitter.
  • the notification receiver is configured to receive a notification instructing the radio network controller to perform the soft handover process as a second radio network controller.
  • the transmission timing determiner is configured to determine a first transmission timing of transmitting the data to base stations managed by the radio network controller among base stations to which the mobile terminal is connected when performing the soft handover, in response to the notification.
  • the data transmitter is configured to transmit, at the first transmission timing, data fragments from a first radio network controller to the base stations managed by the radio network controller among the base stations to which the mobile terminal is connected when performing the soft handover, in response to the notification.
  • a seventh aspect of the present invention is summarized as a radio network controller for performing a soft handover process for allowing soft handover of a mobile terminal, when the mobile terminal is performing the soft handover, in uplink radio data communications in which the mobile terminal transmits data via a base station.
  • the radio network controller includes a notification receiver, a selective combiner, and a reconstructor.
  • the notification receiver is configured to receive a notification instructing the radio network controller to perform the soft handover process as a first radio network controller.
  • the selective combiner is configured to perform selective combining of data fragments from all base stations to which the mobile terminal is connected when performing the soft handover, in response to the notification.
  • the reconstructor is configured to reconstruct the data from the selectively combined data fragments, in response to the notification.
  • a tenth aspect of the present invention is summarized as a radio data communications method in which at least one of a first radio network controller and a second radio network controller performs a soft handover process for allowing soft handover of a mobile terminal, when the mobile terminal is performing the soft handover.
  • a radio network controller performing the soft handover process is changed when the mobile terminal is performing the soft handover.
  • the synchronization controlling unit 14 controls synchronization between the mobile terminal MN 1 and a given access point AP, an access router AR and/or a router RT based on the reception timing of the data.
  • the receiving unit 31 serves as a notification receiver configured to receive a notification instructing the router to perform the soft handover process for the mobile terminal MN 1 as a first or second radio network controller (an uppermost control point or a lower control point), or not to perform the soft handover process for the mobile terminal MN 1.
  • the sequence number providing unit 37 provided in the first radio network controller adds information requesting the sequence number providing status (a sequence number providing status notification request bit) to a data fragment for transmission to the second radio network controller (e.g., the access router AR 1), cooperating with the transmitting unit 32.
  • the retransmission controlling unit 41 performs L2-frame-unit retransmission control between the router and the mobile terminal MN 1, when control point change information (notification) instructing the router to operate as an uppermost control point is received.
  • the radio data communications system in this embodiment can operate as shown in FIG. 9, thereby performing a control point change without causing loss of data.
  • control server 50 determines the addition of a branch to the access point AP 3 and, as a result of computation, determines the addition of the router RT 2, for example, as a control point.
  • step 106 the access router AR 1 notifies the router RT 2 of synchronization information having been used until that time such as data delays and timing differences (clock timing differences) between the access points AP 1 and AP 2 and the mobile terminal MN 1 and transmission timings.
  • step 107 the router RT 2 measures a data delay and a timing difference (clock timing difference) between the router RT 2 and the access router AR 1.
  • step 114 the access points AP 1 to AP 3 perform the process of timing transmission to the mobile terminal MN 1 at the specified transmission timings.
  • Steps 106 to 108 may be performed in parallel with steps 109 and 110.
  • step 104 Now the sequence number taking over process (step 104) will be described with reference to FIG. 10.
  • control point change can cause lack of continuity of sequence numbers, largely increasing a data transmission interval, or in the worst case, cause loss of data.
  • Control as shown in FIG. 10 can avoid the above problems, that is, can allow sequence number taking over with maintained continuity.
  • step 207 the router RT 2 calculates the number of data fragments in L2 frame format transmitted to the access router AR 1 after step 202, and a sequence number to be provided to the next data fragment in L2 frame format to be transmitted to the access router AR 1, based on the sequence number received in step 206.
  • the mobile terminal MN 1 is connected to the access points AP 1 to AP 3 in the network shown in FIG. 4, and the router RT 2 and the access router AR 1 constitute control points.
  • the mobile terminal MN 1 then removes the branch to the access point AP 3, so that the router RT 2 as the control point is removed (switching to a soft handover process performed only by the access router AR 1).
  • the radio data communications system can operate as shown in FIG. 11, thereby performing a control point change without causing loss of data.
  • step 301 before the removal of the branch to the access point AP 3, synchronization is established among the router RT 2, the access router AR 1 as control points, the access points AP 1 to AP 3 and the mobile terminal MN 1.
  • the access point AP 3 notifies the control server 50 of the removal of the branch from the mobile terminal MN 1 to the access point AP 3, that is, the disconnection between the mobile terminal MN 1 and the access point AP 3.
  • Such notification may be done from the mobile terminal MN 1 to the control server 50 or may be done from the access point AP 3 detecting the disconnection to the control server 50.
  • step 703 the control server 50 transmits to the access router AR 1 control point change information to instruct that the upper router RT 2 is removed from the control points and the access router AR 1 becomes an uppermost control point, and transmits to the router RT 2 control point change information to instruct its removal from the control points.
  • the access router AR 1 receives L2 frame format data from the access points AP 1 and AP 2, and in step 708, the access router AR 1 performs the selective combining process, retransmission controlling process and reconstructing process on the received data.
  • the router RT 2 (the former uppermost control point) and the access router AR 1 (the new uppermost control point) reconstruct respective halves of L3 frame format data which are then combined together at one of them (e.g., the router RT 2).
  • step 801b the router RT 2 (an uppermost control point) performs the selective combining process, retransmission controlling process and reconstructing process on L2 frame format data from the access router AR 1 and the access point AP 3, and transmits the reconstructed L3 frame format data to the corresponding node CN 1.
  • control server 50 determines the removal of the access router AR 1 from the control points, for example, as a result of computation.
  • step 805a the router RT 2 receives the L2 frame format data from the access point AP 2 via the access router AR 1, and in step 805b, the router RT 2 also receives L2 frame format data from the access point AP 3.
  • the access router AR 1 may perform buffer control on the L2 frame format data from the access point AP 2.
  • step 806 the router RT 2 continuously performs the selective combining process, retransmission controlling process and reconstructing process on the L2 frame format data received from the access points AP 2 and AP 3.
  • step 807 the router RT 2 transmits the completed L3 frame format data to the corresponding node CN 1 via the router RT 1.
  • step 901 before the addition of a branch to the access point AP 1, the router RT 2 as an uppermost control point performs the selective combining process, retransmission controlling process and reconstructing process on L2 frame format data.
  • the access router AR 1 only relays (transfers) L2 frame format data from the access point AP 2 to the router RT 2.
  • step 902 the mobile terminal MN 1 notifies the control server 50 of the fact that the radio environment between the mobile terminal MN 1 and the access point AP 1 becomes better.
  • control server 50 determines the addition of the branch to the access point AP 1, and, as a result of computation, determines the addition of the access router AR 1 as a control point, for example.
  • the control server 50 transmits to the access point AP 2 control point change Information to instruct that the access router AR 1 becomes its directly upper control point, transmits to the access router AR 1 control point change information to instruct it to become a control point between the access points AP 1 and AP 2 and the router RT 2, and transmits to the router RT 2 control point change information to instruct that the access point AP 2 is not connected directly below and the access router AR 1 is added as a new lower control point.
  • step 904 upon receiving the control point change information, the access router AR 1 starts the selective combining process on L2 frame format data from the access points AP 1 and AP 2.
  • step 905 the access router AR 1 notifies the access points AP 1 and AP 2 of the start of reception of L2 frame format data.
  • step 906 the access router AR 1 receives L2 frame format data from the access points AP 1 and AP 2. In step 907, the access router AR 1 performs only the selective combining process on the received data. In step 908, the access router AR 1 transmits the selectively combined L2 frame format data to the router RT 2 as an upper control point.
  • step 909 the router RT 2 continuously receives L2 frame format data also from the access point AP 3.
  • step 911 the router RT 2 transmits the completed L3 frame format data to the corresponding node CN 1 via the router RT 1.
  • the maximum number of branches to which the mobile terminal MN 1 can be connected at a time is three, so that the number of control points is maximum two.
  • the present invention is not limited thereto and is applicable to a desired number of branches and a desired number of control points.
  • the present invention can accommodate every control point change pattern by an appropriate combination of the above-described four patterns. For example, when a control point is added or removed in a transition between a one-branch state and a two-branch state, the above combination can accommodate it.
  • a router not serving as a control point may be located in a path therebetween. In that case, the router only relays data.
  • a radio network controller (control point) performing the soft handover process for the mobile terminal MN 1 can be changed when the mobile terminal MN 1 is performing soft handover in uplink or downlink radio data communications, thereby to allow the optimization of the data transmission and reception path and an effective use of network resources.
  • a control point can be placed upstream of the then control point (second radio network controller) , or processes performed at a control point (first radio network controller) placed uppermost until that time can be stopped, or processes performed at a control point (second radio network controller) placed downstream of a control point (first radio network controller) placed uppermost until that time can be stopped, or a control point (second radio network controller) can be placed downstream of a control point (first radio network controller) placed uppermost until that time, which results in a more flexible optimization of the data transmission and reception path.
  • the present invention can provide a radio data communications method, a server and a radio network controller which allow a change of control points located in a network without causing loss of data when the mobile terminal MN 1 is performing a soft handover.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)
EP20040004431 2003-02-26 2004-02-26 Procédé de transmission de données par radio, serveur et contrôleur de réseau radio Withdrawn EP1453342A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003050019A JP2004260620A (ja) 2003-02-26 2003-02-26 無線データ通信方法、サーバ装置及び無線制御装置
JP2003050019 2003-02-26

Publications (1)

Publication Number Publication Date
EP1453342A1 true EP1453342A1 (fr) 2004-09-01

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EP20040004431 Withdrawn EP1453342A1 (fr) 2003-02-26 2004-02-26 Procédé de transmission de données par radio, serveur et contrôleur de réseau radio

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US (1) US7151934B2 (fr)
EP (1) EP1453342A1 (fr)
JP (1) JP2004260620A (fr)
CN (2) CN101098562B (fr)

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CN110383775B (zh) * 2017-03-30 2021-03-30 华为技术有限公司 数据传输方法和通信设备
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Also Published As

Publication number Publication date
CN101098562B (zh) 2011-11-30
US7151934B2 (en) 2006-12-19
CN101098562A (zh) 2008-01-02
US20040229649A1 (en) 2004-11-18
JP2004260620A (ja) 2004-09-16
CN1525784A (zh) 2004-09-01

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